herdd: support updated service config layout

services/herdd/service.c

@@ -9,7 +9,6 @@
 #include <fx/string.h>
 #include <fx/stringstream.h>
 #include <launch.h>
-#include <magenta/log.h>
 #include <rosetta/bootstrap.h>
 #include <spawn.h>
 #include <stdio.h>
@@ -53,11 +52,11 @@ static int parse_service_data(fx_object *in, struct service *out)
 	fx_value_get_object(description_v, &description);
 
 	const fx_value *exec_v = fx_hashtable_get(in_service, &FX_CSTR("exec"));
-	if (!exec_v || !fx_value_is_type(exec_v, FX_TYPE_STRING)) {
+	if (exec_v && !fx_value_is_type(exec_v, FX_TYPE_ARRAY)) {
 		return -1;
 	}
-	fx_string *exec = NULL;
-	fx_value_get_object(exec_v, &exec);
+	fx_value_get_object(exec_v, &out->s_exec);
+	fx_object_ref(out->s_exec);
 
 	const fx_value *roles_v
 		= fx_hashtable_get(in_service, &FX_CSTR("roles"));
@@ -95,7 +94,6 @@ static int parse_service_data(fx_object *in, struct service *out)
 	fx_iterator_unref(it);
 
 	out->s_description = fx_string_steal(description);
-	out->s_exec = fx_string_steal(exec);
 
 	return 0;
 }
@@ -170,12 +168,22 @@ int service_start(struct service *svc)
 	log("Starting %s...", svc->s_description);
 
 	pid_t child = 0;
-	char *const argv[] = {
-		svc->s_name,
-		NULL,
-	};
+	size_t nr_args = fx_array_get_size(svc->s_exec);
 
-	int err = posix_spawn(&child, svc->s_exec, NULL, NULL, argv, NULL);
+	const char **argv = calloc(nr_args + 1, sizeof *argv);
+	for (size_t i = 0; i < nr_args; i++) {
+		const fx_value *str = fx_array_get_ref(svc->s_exec, i);
+		fx_value_get_cstr(str, &argv[i]);
+	}
+
+	int err = posix_spawn(
+		&child,
+		argv[0],
+		NULL,
+		NULL,
+		(char *const *)argv,
+		NULL);
+	free(argv);
 
 	if (err == 0) {
 		log_ok("Started %s.", svc->s_description);

services/herdd/service.h

@@ -3,6 +3,8 @@
 
 #include "queue.h"
 
+#include <fx/collections/array.h>
+
 enum service_role {
 	SVC_ROLE_NONE = 0x00u,
 	SVC_ROLE_NAMESPACE_PROVIDER = 0x01u,
@@ -11,7 +13,7 @@ enum service_role {
 struct service {
 	char *s_name;
 	char *s_description;
-	char *s_exec;
+	fx_array *s_exec;
 	enum service_role s_roles;
 	struct queue_entry s_entry;
 };